Dialkyl-substituted naphtho-dioxodibenzothiophene monomer and preparation method thereof and polymer containing dialkyl-substituted naphtho-dioxodibenzothiophene unit and application of polymer

The invention discloses a dialkyl-substituted naphtho-dioxodibenzothiophene monomer and a preparation method thereof and a polymer containing a dialkyl-substituted naphtho-dioxodibenzothiophene unit and the application of the polymer. A high-absorption electron unit -SO2- exists in the dialkyl-substituted naphtho-dioxodibenzothiophene monomer, and thus the electron affinity of a molecule can be improved. Through introducing of an unsymmetrical substituting condensed ring structure and an alkyl group, the electron affinity of the monomer can be lowered, and meanwhile, solubleness of the monomer in organic solvent is improved greatly. The dialkyl-substituted naphtho-dioxodibenzothiophene monomer obtains a homopolymer or a copolymer containing the dialkyl-substituted naphtho-dioxodibenzothiophene unit through Suzuki or Stille or Yamamoto polymerization reaction, and the obtained polymer has good solubleness in the organic solvent, is suitable for solution processing, and has wide application prospects in prepara